add pt2tf tool

pt2tf/onnx-tensorflow/onnx_tf/handlers/backend/selu.py

@@ -0,0 +1,33 @@
+import tensorflow as tf
+
+from onnx_tf.handlers.backend_handler import BackendHandler
+from onnx_tf.handlers.handler import onnx_op
+from onnx_tf.handlers.handler import tf_func
+
+
+@onnx_op("Selu")
+@tf_func(tf.nn.selu)
+class Selu(BackendHandler):
+
+  @classmethod
+  def _common(cls, node, **kwargs):
+    tensor_dict = kwargs["tensor_dict"]
+    if "alpha" not in node.attrs and "gamma" not in node.attrs:
+      return [cls.make_tensor_from_onnx_node(node, **kwargs)]
+
+    x = tensor_dict[node.inputs[0]]
+    alpha = node.attrs.get("alpha", 1.67326319217681884765625)
+    gamma = node.attrs.get("gamma", 1.05070102214813232421875)
+
+    return [
+        tf.clip_by_value(x, 0, tf.reduce_max(x)) * gamma +
+        (tf.exp(tf.clip_by_value(x, tf.reduce_min(x), 0)) - 1) * alpha * gamma
+    ]
+
+  @classmethod
+  def version_1(cls, node, **kwargs):
+    return cls._common(node, **kwargs)
+
+  @classmethod
+  def version_6(cls, node, **kwargs):
+    return cls._common(node, **kwargs)